diff --git a/llvm/lib/DebugInfo/DWARF/DWARFVerifier.cpp b/llvm/lib/DebugInfo/DWARF/DWARFVerifier.cpp
index 68bacbfda4675..c96dcebf24948 100644
--- a/llvm/lib/DebugInfo/DWARF/DWARFVerifier.cpp
+++ b/llvm/lib/DebugInfo/DWARF/DWARFVerifier.cpp
@@ -112,11 +112,9 @@ bool DWARFVerifier::verifyUnitHeader(const DWARFDataExtractor DebugInfoData,
   bool ValidAbbrevOffset = true;
 
   uint64_t OffsetStart = *Offset;
-  Length = DebugInfoData.getU32(Offset);
-  if (Length == dwarf::DW_LENGTH_DWARF64) {
-    Length = DebugInfoData.getU64(Offset);
-    isUnitDWARF64 = true;
-  }
+  DwarfFormat Format;
+  std::tie(Length, Format) = DebugInfoData.getInitialLength(Offset);
+  isUnitDWARF64 = Format == DWARF64;
   Version = DebugInfoData.getU16(Offset);
 
   if (Version >= 5) {